naz would have been so unlike anyone mayweather has faught before that it's difficult to predict how he owuld handle fighting someone like naz. i think floyd would deliver a boxing lesson and probably embaress naz but it would have been interesting to see how floyd would have handled being hit by someone like naz.
and i don't think it would have been that unlikely that naz would have signed for this fight, he never really avoided anyone and faught barrera and nearly faught morales. yes his reasons for fighting barrera may have been because he was pretty sure he would make easy work of him (as some of you guys reckon). but lets not forget that barrera was coming off the first fight with morales and so naz had just seen (he was at the fight) how dangerous barrera is and what he can do.
it's just as likely that mayweather wouldn't sign for this fight as it is that naz wouldnt. mayweather hasn't really got a history for fighting the best possible opposition either.